Laser beam welding of dissimilar stainless steels in a fillet joint configuration

Khan, M.M.A.; Romoli, Luca; Fiaschi, M.; Dini, Gino; Sarri, F.

doi:10.1016/j.jmatprotec.2011.11.011

Cited by 77 publications

(26 citation statements)

References 11 publications

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“…Finalmente está el tipo F caracterizado por una solidificación completa como ferrita δ y una posterior transformación ferrita δ -austenita en estado sólido, éste modo de solidificación es característico de los aceros inoxidables dúplex y presenta morfologías de ferrita δ acicular, globular o placas de austenita Widmanstätten [1,11,14,15,19]. Se han realizado uniones disímiles de AIA con AIF mediante soldadura por fricción [20,21] y soldadura por láser [22], estos procesos involucran cambios microestructurales diferentes a los de soldadura por arco eléctrico. En la industria petroquímica se emplea comúnmente la soldadura SMAW para reparaciones y debido a su fácil aplicación en campo, sin embargo, no se han desarrollado trabajos enfocados hacia el estudio de la influencia de este proceso en uniones disímiles de AIA con AIF, por lo tanto se hace necesario el entendimiento de la influencia de los parámetros de soldadura y la composición química de los electrodos en los cambios microestructurales que ocurren en la unión soldada disímil y la relación de éstos con las propiedades mecánicas del cupón de soldadura.…”

Section: Transformaciones Microestructurales En Soldaduras Disímiles unclassified

Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico

2015

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Este es un artículo publicado en acceso (Open Access) abierto bajo la licencia Creative Commons Attribution NonCommercial, que permite su uso, distribución y reproducción en cualquier medio, sin restricciones siempre que sin fines comerciales y que el trabajo original sea debidamente citado.Recibido: 25 Set., 2014 Aprobado: 16 Mar., 2015 E-mail: sara.aguilar@udea.edu.co (SMAS)Resumen: En este trabajo se estudian los fenómenos metalúrgicos que ocurren en la soldadura SMAW de un acero inoxidable ferrítico AISI 430 con un acero inoxidable austenítico AISI 316L. Para el estudio se utilizaron dos tipos de electrodos: austenítico AWS E309L y dúplex AWS E2209-16, ambos con un diámetro de 3,2 mm. Las uniones soldadas se realizaron con un solo pase y se variaron simultáneamente la corriente y la velocidad de soldadura; las condiciones fueron 49 A y 2,4 mm.s -1 como valores bajos y 107 A y 4,3 mm.s -1 como valores altos. Se evaluó la influencia del tipo de electrodo y de los parámetros de soldadura en la evolución microestructural de las zonas afectadas por el calor y de las zonas de fusión, encontrando diferencias en la morfología y cantidad de ferrita delta para todas las condiciones estudiadas. Se evidenció crecimiento y refinación de grano ferrítico y formación de martensita en la zona afectada por el calor del metal base ferrítico. Se evaluó también la resistencia a la tensión hallando similitudes en todas las soldaduras.Palabras-clave: Soldadura de aceros inoxidables; SMAW; Metalurgia de la soldadura; Acero inoxidable austenítico; Acero inoxidable ferrítico. Microstructural Transformations in Dissimilar Welds between Austenitic Stainless Steel and Ferritic Stainless SteelAbstract: This research studies the metallurgical transformations taking place the SMAW welding of AISI 316L austenitic stainless steel with AISI 430 ferritic stainless steel. To perform the study were used two different electrodes, AWS E309L austenitic and AWS E2209-16 duplex stainless steels 3.2 mm diameter. The joints were made with a single-pass welding including current and welding speed variations; the low values were 49 A and 2,4 mm.s -1 and the high values were 107 A and 4,3 mm.s -1 . This study evaluated the influence of the type of electrode and the welding parameters on the microstructural evolution of heat affected and fusion zones. Also, differences were found on morphology and delta ferrite amount for all weld metals. The heat affected zone of the ferritic side showed grain coarsening and grain refinement with martensite at the grain boundaries. Tensile strength was similar for all welded joints. Key-words:Stainless steel welding; SMAW; Welding metallurgy; Austenitic stainless steel; Ferritic stainless steel. IntroducciónLos aceros inoxidables (AI) son ampliamente usados en aplicaciones a elevadas temperaturas cuando los aceros al carbono y los aceros de baja aleación no presentan una adecuada resistencia a la corrosión. Los aceros inoxidables austeníticos (AIA) tienen mejor resistencia a la corrosión que los aceros inoxidables ferríti...

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Section: Transformaciones Microestructurales En Soldaduras Disímiles unclassified

Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico

2015

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“…Khan et al concluded that laser power and incident beam angle is the key factor that determines the weld bead geometry in the process of AISI 304 and AISI 340 dissimilar laser welding [11]. Dissimilar laser spot welds between low carbon and austenitic stainless steels are carried out by Torkamany with good results in terms of tensile-shear monotonic loading [12].…”

Section: Introductionmentioning

confidence: 99%

“…Another aspect to be taken into consideration for the stainless steel-carbon steel welded couple is the formation of delta ferrite phase, more susceptible to grain boundary corrosion as well as of a residual austenite phase [16] due to the fast cooling of the metal bath that leads to an incomplete δ-γ transformation [2,4,17], phenomena which are more pronounced with the decreasing of materials thickness.…”

Section: Introductionmentioning

confidence: 99%

Dissimilar Laser Welding of AISI 321 and AISI 1010

et al. 2018

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This paper presents the dissimilar laser welding of AISI 321 stainless steel and AISI 1010 carbon steel thin sheets in butt joint geometry using a 1 kW diode laser. Influence of the welding speed on the geometry and microstructure of the joints is discussed. Structural characterisation of the welds is realised through optical, electron microscopy and EDS analysis, observing distinct mixed and unmixed areas in the weld bead because of the high cooling rate. The weld bead presents an austenitic-martensitic-ferrite structure, characterized by austenitic twin grains with ferrite particles precipitated on grain boundaries, and islands comprising a ferritemartensite structure. Chromium and nickel migration in the weld bead area was observed. Good tensile behaviour of the dissimilar joints was obtained, as all the specimen failure occurs far-off the weld zone.

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“…Previously, researches have proved that the microstructure of weld and heat affected zones is a function of the cooling rate of high temperature [13][14][15]. As a result, the austenite/ferrite balance within fusion zone is expected to be influenced by welding speed and laser power [16,17]. But the research region has got relatively few explorations, more efforts are needed for in-depth understanding of the influence of various laser welding parameters on duplex stainless steel properties.…”

Section: Introductionmentioning

confidence: 99%

The effect of fiber laser parameters on microhardness and microstructure of duplex stainless steel

et al. 2016

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Abstract. An investigation was implement to study the influence of laser power, and speed of the welding on hardness, microstructure, and penetration of laser welding bead on plate duplex stainless steel, which is not exhibited so far. A fiber laser was selected for welding duplex stainless steel sheet with 2 mm thickness. Then, optical microscope (OM) was used in the morphologic observation of cross section, penetration depth, and bead width. Microhardness of the welded sheet was measured using Vickers hardness. Profiles of hardness and microstructure were utilized to discriminate welding line and to propose superior welding parameters. The experimental results displayed that, a good quality of duplex steel welds can be acquired when a suitable fiber laser welding parameters were selected. It was found that microhardness profiles showed a rise in the hardness of the weld and heat-affected zones as the solidification process proceeds rapidly. Additionally, the crystal solidification process induced by the fiber laser welding was schematically clarified and systematically exposed.

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Laser beam welding of dissimilar stainless steels in a fillet joint configuration

Cited by 77 publications

References 11 publications

Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico

Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico

Dissimilar Laser Welding of AISI 321 and AISI 1010

The effect of fiber laser parameters on microhardness and microstructure of duplex stainless steel

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